Cannot connect SPP using rfcomm

[sunxiaohuix]

Step1.
1- Enable bluetooth on Edison1 and Edison2
"rfkill unblock bluetooth"
2- Start bluetoothctl on both devices
3- Edison1 :
power on
agent DisplayOnly
default-agent
discoverable on
4- Edison2: scan on
5- Edison2 : (also accept connection on Edison1)
trust [edison1 Mac]
pair [edison1 Mac]

Step2.
On edison 1 :
rfcomm listen 0 22

On Edison2:
rfcomm connect 0 [Edison1 Mac] 22

Failed info:
Can't connect RFCOMM socket: Connection refused